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bug#40278: 27.0.90; Flickering in Windows 10

From: martin rudalics
Subject: bug#40278: 27.0.90; Flickering in Windows 10
Date: Tue, 31 Mar 2020 10:48:45 +0200

> I can see it here, especially on scroll towards the beginning of the
> file (Emacs is maxing out the CPU while doing this

It maxes out here as well but I do not need to display a child frame for
that purpose.  Simply scrolling through dispextern.h suffices.  Here it
typically pauses for about ten seconds without any flicker though.

> ).  It kind of looks
> like the rectangle beneath the child frame gets repainted separately
> from the rest.

I have no idea why this should be related to scrolling.  Does any of
these happen with a normal frame put on top of the window you scroll?


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